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by Morgoth » Tue Sep 30, 2008 5:42 am
26 letters for each letter

4 letter = 26*26*26*26 = 26^4

5 letter = 26*26*26*26*26 = 26^5

26^4 + 26^5 = 26^4 ( 26+1) = 27*26^4

Hope this helps.
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